Accession Number:

ADA059562

Title:

Characteristic Exoemission From Oxide Covered Aluminum Alloys.

Descriptive Note:

Final rept.,

Corporate Author:

WASHINGTON STATE UNIV PULLMAN DEPT OF PHYSICS

Personal Author(s):

Report Date:

1978-07-01

Pagination or Media Count:

128.0

Abstract:

Electrons, positive and negative ions as well as photons are known to be emitted from oxides of a number of metals during tensile deformation. It has been shown that the propagation of cracks in the oxide is uniquely associated with this so-called tribo-stimulated exoemission phenomenon. In this report we describe experiments concerning the tribo-stimulated emission of negatively charged particles from oxidized bare and aluminum clad Al 2024 and Al 7075. The investigated samples were anodically oxidized under various conditions to produce oxide layers of different thickness, as well as chemical and mechanical properties. Our working hypothesis is that exoemission during tensile elongation is determined by the physical and chemical properties of the oxide layer. Evidence in support of this hypothesis is presented for the bare and clad alloys studied to date. The features of the exoemission curves emission rate vs. strain of the substrate that appear to be most sensitive to changes in the oxide layer presented and discussed. Author

Subject Categories:

  • Inorganic Chemistry
  • Metallurgy and Metallography
  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE